The number of echoes combined into a single image or image set in multiple echo imaging sequences or echo-train techniques such as rapid acquisition with relaxation enhancement (RARE), fast-spin echo (FSE), and turbo spin-echo (TSE). In RARE imaging, the ETL typically equals the acceleration factor.
As for tooth pain, it is caused by a reaction of the nerves inside a tooth's pulp chamber with the severity dependent upon the type and degree of the stimulus. What follows are some examples of symptoms you may be feeling and their possible causes.
Tooth sensitivity is caused when the outside of teeth, or the hard enamel, wears down or gums recede and the tiny tubes in the tooth dentin become exposed. Each of those tiny tubes contains a lot of nerve endings, and when theyâre left open, it can hurt when you put hot or cold things in your mouth. A lot. âWhat causes the enamel to wear away?â Most often, tooth enamel wears away due to eating of too many acidic foods or drinks, excessive acid reflux, brushing too hard, or by clenching or grinding.